Anesthetic compound



HUNITEAIJST-ATES PATENT omca.

OLIVER KAMIVL AND BOG-ER ADAMS, .OF URBANA, AND ERNEST H. VOLWILEl-t, F QHICAGO,'ILLINOIS, ASSIGNORS TO THE ABBOTT LABORATORIES, OF CHICAGO, A ILLINOIS, A CORPORATION OF ILLINOIS.

No Drawing.

' '1 0 all whom it may concern.

Be it known that we, OLIVER Karma and oonn ADAMS, reslding at Urbana, 1n the county of Champaign and State of Illinois,

0 (pounds, ofwhich the following is a specifi cation. a

Our-invention relates to the production of di-n-butyl amino alcohol esters of aromatic acids.

Gene m method of synthesizing compounds ofthz's series. Benzoyl chlorid or a substituted benzoyl chl orid is dissolved in benzene, and treated with a molecule of a di-n-butyl-a uino alcohol and-thegnixture refluxed about an hour;

the reaction-mixture is then treated with dilute acid in ordeiy to dissolve all thebasic compounds and tl1e""a -1ueous layer made alkaline with sodium hydroxid. This precipitates the di-n-butyl amino alcohol ester of the benzoic acid used, which can be extracted and dissolved in hydrochloric acid in order to produce the salt.

A specific compound.

A specific compound belonging to the general series as above defined is the li-di-n-butyl amino ethyl alcohol ester of p-amino benzoic acid. This compound may be prepared by the general process described above. In benzene as a solvent, one gram molecule of p-nitrobenzoyl chlorid is added to one gram molecule of [fi-di-n-butyl amino ethyl alcohol and the mixture refluxed an hour on a water bath. (Di-n-butyl amino ethyl alcohol, which has not yet been described in the literature, is readily formed by the condensation of ethylene chlorhydrin and di-n-butyl amin and boils 225-230 at at- V mospheric pressure with slight decomposition). The reaction mixture is then shaken with dilute hydrochloric acid and the aqueous layer treated with tin and, if necessary,

Specification of Letters Patent.

I molecule of hydrochloric acid.

.a'ians'rieii'rrc comrouun.

Patented Nov. 16, 1920.

Application filed January as, 1920. serial no. see-e12.

a little more hydrochloric acid. The temperature should be kept at about so that the. minimum amount of hydrolysis Will take place. When no more heat is evolved, due to the reaction, heat is applied to maintain the temperature at 50 C. for about one-half hour longer. The solution is poured off from the excess tin, diluted with water andfreed from tin by means of hydrogen sulfid. Upon filtering off the tin sulfid and making alkaline, the di-n-butyl amino ethyl ester of p-amino benzoic acid separates out. This is extracted and then treated With one In this way, the monohydrochlorid is produced which crystallizes from water in white crystals, melting at 170-1752 By using other acids for dissolving the base, other salts are produced.

Another specific member belonging to this series is the gamma-di-n-butyl amino propyl alcohol ester of para-amino benzoic acid, the hydrochlorid of which melts at 104405 C.

The di-n-butyl amino alcohol esters of aromatic acids above specified are either liquid compounds or low-melting solids. They are insoluble in Water but readily soluble in ether. All of these bases, as well as their various salts, possess anesthetic properties. When heated with an aqueous solution of alkali they undergo decomposition yielding di-n-butyl amino alcohols and salts of the aromatic acids.

The scope of the invention should be determined by the language of the appended claims which should be interpreted as broadly as possible consistent with the state .of the art.

We claim as our invention: 1. As a new article of manufacture, a compound having the general formula:

Where Ar represents an aryl group containing a benzene nucleus, where X represents at least one, and where R represents an n-butyl group.

2. As a new article of manufacture,

mse m di-n-loutyl amino alcohol ester of an aro- 4. As af'new anesthetic compound, the matic acid containing a benzene nucleus. B-dirn-butyl amino ethyl ester of p-amino 10 "3. As a new article of manufacture, the benzoic acid which is a low-melting solid 3=di-n-butyl amino ethyl ester of p-amino forming a monohydrochlorid melting at 5 benzoic acid, a compound possessing the 172 C. structure: OLIVER KAMM'.

ROGER ADAMS. mn nc n ooocn cn n(Q1102 ERNEST H. VOLWILER. 

